How many glasses of water do you drink a day?

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When I´m on a diet i usually drink a lot of water so i don´t get hungry that often and get my mind off eating. My doctor ordered that i had to drink at least 3lt of water a day.The only problem was that i had to pee every 5 minutes. At home thats not much of a problem, and when i had to go out i would immediately locate the nearest rest room. But now that i´m back at the office it´s a little embarrasing having to go that often. People even start saying that i spend too much time at the bathroom, they probably think it´s my way of goofing around and not working but it´s not intentional. So now i´m thinking about postponing my water drinking habit for a while or at least drinking less. Do you know what the recommended number of glasses of water is?